const int sendorPin = A0;
const float baselineTemp = 20.0;


void setup() {
  Serial.begin(9600);
  for(int pinN = 2;pinN < 5; pinN++){
    pinMode(pinN , OUTPUT);
    digitalWrite(pinN , LOW);
  }
}

void loop() {
 int value = analogRead(sendorPin);
 Serial.print("Serial value: ");
 Serial.print(value);
 
 float voltage = (value/1024) * 5.0;
 Serial.print("Voltage: ");
 Serial.print(voltage);
 
  float deg = (voltage - .5) * 100;
  Serial.print("Temperature : ");
  Serial.println(deg);

  if(deg<baselineTemp){
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
  }else{
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
  }
  delay(50);
}